Mercurial > octave
view liboctave/numeric/DET.h @ 27919:1891570abac8
update Octave Project Developers copyright for the new year
In files that have the "Octave Project Developers" copyright notice,
update for 2020.
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 06 Jan 2020 22:29:51 -0500 |
parents | b442ec6dda5c |
children | bd51beb6205e |
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/* Copyright (C) 2008-2020 The Octave Project Developers See the file COPYRIGHT.md in the top-level directory of this distribution or <https://octave.org/COPYRIGHT.html/>. This file is part of Octave. Octave is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. Octave is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Octave; see the file COPYING. If not, see <https://www.gnu.org/licenses/>. */ #if ! defined (octave_DET_h) #define octave_DET_h 1 #include "octave-config.h" #include <cmath> #include "lo-mappers.h" #include "oct-cmplx.h" template <typename T> class base_det { public: base_det (T c = 1, int e = 0) : c2 (), e2 () { c2 = octave::math::log2 (c, e2); e2 += e; } base_det (T c, double e, double b) : c2 (), e2 () { e *= octave::math::log2 (b); e2 = e; c *= octave::math::exp2 (e - e2); int f; c2 = octave::math::log2 (c, f); e2 += f; } base_det (const base_det& a) : c2 (a.c2), e2 (a.e2) { } base_det& operator = (const base_det& a) { c2 = a.c2; e2 = a.e2; return *this; } T coef (void) const { return c2; } int exp (void) const { return e2; } T value () const { return c2 * static_cast<T> (std::ldexp (1.0, e2)); } operator T () const { return value (); } base_det square () const { return base_det (c2*c2, e2+e2); } void operator *= (T t) { int e; c2 *= t; // Renormalize c2 to [0.5, 1), and find required change in exponent. c2 = octave::math::log2 (c2, e); e2 += e; } private: T c2; int e2; }; // Provide the old types by typedefs. typedef base_det<double> DET; typedef base_det<float> FloatDET; typedef base_det<Complex> ComplexDET; typedef base_det<FloatComplex> FloatComplexDET; #endif